he has yet to be charged in connection with the attack or been notified of his miranda rights, however, this morning officials tell nbc news he's awake and using pen and paper to answer questions from investigators. all of this as the fbi says it has obtained surveillance footage showing tsarnaev putting down his backpack near the finish line just minutes before the explosion. massachusetts governor deval patrick says he's been briefed on the footage. >> the suspect took the backpack off, put it down, did not react when the first explosion went off and then moved away from the backpack in time for the second explosion, so pretty clear about his involvement and pretty chilling, frankly. >> all right, so while we wait on that video, i want you to look at these new infrared images released showing the final intense moments of the manhunt. stun grenades just exploded as police moved in to capture the 19-year-old, and it capped a nearly four-day search for dzhokhar and his older brother, tamerlan, and while the nation was reeling, we are getting word this morning that the brothers actually